Apricot tree named `Dunstan`

ABSTRACT

The present invention relates to a new and improved variety of apricot  tr The fruit of the new variety is characterised by an attractive orange color, medium to large size, and firm flesh with sweet flavor. The tree is characterised by moderately vigorous healthy growth and an upright tree habit. The new variety has been named `Dunstan`.

ORIGIN OF THE VARIETY

The new and distinct variety of apricot tree (Prunus armeniaca) wasselected from a population of approximately 2000 seedlings originated byDr Ron Beatson in 1986. The seedlings were grown on a site near Clyde,Central Otago, New Zealand's major apricot growing area. The seedlingsbegan to fruit in 1990, and were evaluated for tree health and fruitflavor, and to a lessor extent skin finish, size and color. In 1993, 49elite seedlings were selected by Dr. Dominique Noiton from thispopulation and grafted onto Golden peach rootstocks for furtherevaluation. One of the seedlings, an open-pollinated seedling of Clutha14/107 (an unpatented New Zealand variety) showed desirable commercialcharacteristics after initial evaluation and was propagated for furthertrials. Furthermore the new and distinct variety has been named`Dunstan`.

The present new apricot tree was first asexually propagated at Clyde,Central Otago, by budding onto Golden Queen rootstocks, the standardapricot rootstock in New Zealand. Seedling rootstocks are routinely usedin New Zealand for ease of propagation. "Golden Queen" is a peach(Prunus persica) variety that is commonly used because it is readilyavailable and easily propagated from stones. It is a relatively vigorousstock that imparts vigor to the scion variety similar to that of treeson their own roots. It also imparts some tolerance to bacterial diseasessuch as Pseudomonas syringae. The resulting trees have propagatedtrue-to-type showing that the distinctive characteristics areestablished and transmitted successfully through succeeding generations.

DESCRIPTION OF THE VARIETY

The new and distinct variety of apricot tree is large size, hasmoderately vigorous upright growth, and is a regular and productivebearer of medium-large sized, firm, juicy fruit with sweet mild flavorand excellent eating quality. The fruit is further characterised byearly to mid-season ripening. `Dunstan` is similar in appearance to theapricot `Sundrop` (unpatented), however, `Dunstan` ripens 5-6 dayslater, has bigger fruit size than `Sundrop`, has stronger flavor, andhas brighter skin color.

BRIEF DESCRIPTION OF THE ILLUSTRATION

The accompanying photograph shows typical specimens of fruit and foliageof the new variety shortly after picking at commercial harvest maturity.The fruit is shown with the suture facing up (top right), view of theapex end (bottom right), side view (top left), view of the stem end(bottom left), a view of the fruit split along the suture line (topmiddle), and a view of the stone (bottom middle.)

DETAILED DESCRIPTION

The following is a detailed description of the new and distinct varietyof apricot tree based on observation of the specimens grown in Clyde,Central Otago, New Zealand. Color code terminology (except those incommon terms) is in accordance with The Royal Horticultural SocietyColour Chart.

Tree:

Size.--The mature tree, from the age of six years and older is typicallyabout 4 meters high by about 6 meters wide, when grown as a multi-leadervase-shaped tree; stem length and caliper are typical of the species.

Vigor.--Typically the amount of growth during one growing season (oneyear) on any shoot is about 600 to about 1000 mm.

Form.--Spreading to upright growth habit.

Productivity.--Typical production from a mature tree of five years orolder is about 50 kg/tree.

Bearing.--Regular.

Health.--Very healthy.

Trunk:

Form.--Stocky.

Texture.--Rough.

Color.--Dark brown (200B).

Branches:

Size.--Medium thickness, long.

Surface.--Rough.

Lenticels.--Numerous, prominent, aligned across the direction of thebranch (165D).

Color of mature wood.--Dark brown (200B).

Color of fresh growth.--Dark red (184A).

Leaves:

Size.--Between 80-90 mm long and 70-80 mm wide for mature leaves.

Shape of tip.--Cuspidate.

Angle of tip.--Obtuse.

Shape of base.--Truncate.

Petiole.--About 45 mm long, 3-5 mm wide. Red coloration (184A) uppersurface grooved.

Glands.--Ranging from 1-4 with an average of 2. Positioned on upperportion of petiole.

Margin.--Serrate.

Color.--Upper side, green (146A). Lower side, green (146B).

Shape.--Cordate.

Flower buds:

Size.--Medium.

Length.--Medium.

Shape.--Round, plump.

Form.--Free.

Surface.--Not pubescent.

Flowers:

Blooming period.--Bloom commences approximately on 26th October.

Size.--Medium, about 25 mm in diameter.

Color.--Near 155D.

Fruit:

Maturity when described.--Eating ripe.

Date of picking.--3rd week of January.

Size.--Large. Average diameter axially, 70 mm. Average transversely insuture plane, 60 mm.

Form.--Ovate, slightly flattened when in the suture plane, and slightlycrowned at the stalk end.

Suture.--Shallow, extends from stem to apex.

Fruit base.--Rounded.

Weight.--Typically 90-120 grams per fruit.

Fruit flavor.--Sweet, low acid, typical apricot flavor.

Juice.--The fruit will express juice if squeezed.

Sugar content.--12-15% Brix.

Cavity.--Rounded.

Apex.--Rounded.

Skin:

Thickness.--Medium.

Texture.--Smooth.

Tendency to crack.--None.

Down.--Scant, very short.

Color.--Deep orange color 25B with a bright red 28A overblush.

Flesh:

Ripens.--Evenly.

Texture.--Firm.

Fibres.--Small, few, tender.

Flavor.--Excellent, sweet.

Eating quality.--Excellent.

Color.--Near the skin, orange 25B. Near the stone, orange 24C.

Stone:

Type.--Freestone, some flesh adherence along ventral edge.

Size.--Typical of the species.

Form.--Ovoid.

Base.--Straight.

Apex.--Nearly rounded.

Surface.--Regularly pitted.

Ridges.--Two distinct ridges towards the sharp end of the stone runningon each side of the suture plane.

Color.--Dark brown 177A.

Tendency to split.--None.

Use: Dessert.

Market.--Local and export.

Keeping quality.--Good.

Shipping quality.--Good.

The tree, flowers, and fruit may vary in slight detail due to variationsin soil types, cultural practices and climatic conditions; the presentbotanical description is that of the variety grown near Clyde, CentralOtago, New Zealand.

We claim:
 1. A new and distinct variety of apricot tree named `Dunstan`,substantially as illustrated and described.